CN215432452U

CN215432452U - Head convex surface axiality adjusting device

Info

Publication number: CN215432452U
Application number: CN202121456815.2U
Authority: CN
Inventors: 黄同福; 冯翼飞; 黄强
Original assignee: Jiangsu Minsheng Heavy Industries Co ltd
Current assignee: Jiangsu Minsheng Heavy Industries Co ltd
Priority date: 2021-06-29
Filing date: 2021-06-29
Publication date: 2022-01-07
Anticipated expiration: 2031-06-29

Abstract

The utility model provides a device for adjusting the coaxiality of convex surfaces of end sockets, which relates to the technical field of precision installation and comprises a central positioning sleeve, a plurality of cross rods, a plurality of vertical rods, a reinforcing part and an elastic positioning part, wherein the central positioning sleeve is sleeved with a plurality of bushings from outside to inside; the central positioning sleeve is arranged in a cylindrical shape, one end of the cross rod is connected with the central positioning sleeve and is distributed along the peripheral outer wall of the central positioning sleeve in an array manner; the number of the vertical rods corresponds to that of the cross rods, and the vertical rods are vertically connected to the end parts of the cross rods along the direction parallel to the central shaft of the central positioning sleeve; the reinforcing parts are respectively and fixedly connected with the connected cross rod and the connected vertical rod; elastic positioning portion sets up and is close to central positioning sleeve side in arbitrary montant bottom, when it received the effort along horizontal pole extending direction, has the degree of freedom that takes place deformation along this effort direction. The utility model can meet the requirement change of the measuring space caused by the diameter of the seal head changing along with the tolerance change through the deformation of the elastic positioning part.

Description

Head convex surface axiality adjusting device

Technical Field

The utility model relates to the technical field of precision installation, in particular to a seal head convex surface coaxiality adjusting device.

Background

Coaxiality is an important parameter for ensuring long-term and stable operation of equipment, and the method for adjusting the coaxiality of the workpiece in the prior art comprises two methods, namely: 1) the method is realized by measuring the distance from the part to the edge of the workpiece for multiple times in a circulating manner, and the method can be adopted for occasions with low coaxiality requirements, but cannot meet the requirements for occasions with high coaxiality requirements, and is time-consuming and labor-consuming due to the fact that measurement needs to be performed for multiple times in a circulating manner; 2) determining the coaxiality by adopting a mode of manufacturing a simple coaxiality positioning tool, taking the axis of a workpiece as a reference axis, putting the workpiece to be adjusted into the coaxiality tool, and positioning and adjusting by using an image measuring instrument; however, in the adjusting and positioning processes, the workpiece needs to be rotated, and different angles and coordinates of the workpiece need to be contrasted and adjusted, so that the problems that the positioning tool is easy to wear, the workpiece is easy to clamp in the tool and the like exist. Meanwhile, the coaxiality of the tools is still not high, and when the size of the workpiece changes along with the tolerance, the tools lose the function and return to the original solution of repeated measurement.

As a tubular pressure container is frequently used in the chemical industry, the end part of the pressure container is generally sealed by a seal head, and then required parts or components are welded at the axis part of the seal head and then assembled, the parts or components welded at the axis part of the seal head are often required to be welded at the positive axis of the seal head, and the requirement on the coaxiality is very high; otherwise, not only the welding quality of the product is affected, but also the final assembly is seriously affected. For example, when a steel cylinder is assembled, a supporting tube needs to be assembled on an end socket, the coaxiality between the supporting tube and the axis of the end socket is in a range of 0.25mm, the requirement is very strict, if the coaxiality requirement cannot be ensured, multiple times of adjustment and shaping are required in the assembling process of the steel cylinder, the production efficiency is seriously influenced, and the great waste of manpower and material resources is caused; and because the plastic and the plastic are assembled, stress concentration is easy to generate, the final quality of the product is generally influenced in the final use process of the product, and safety accidents are caused in serious cases. Therefore, the problem of ensuring the coaxiality of parts in the axial direction of the end socket is always a concern of related industries.

In addition, according to the technical content requirements of the national standard GB/T25198-; because the diameters of the end sockets have tolerance, the maximum and minimum diameter difference of the same batch of end sockets can reach 11mm, and the simple coaxiality positioning tool cannot meet the use requirement of coaxiality positioning of the end socket axis position parts with larger tolerance.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a device for adjusting the coaxiality of the convex surface of a seal head, which realizes the elastic adjustable contact with the convex surface of the seal head by arranging an elastic positioning part, solves the technical problem that the simple coaxiality positioning tool in the prior art cannot meet the application requirement of the diameter of the seal head changing along with the tolerance, and meets the requirement of measurement space caused by the diameter of the seal head changing along with the tolerance through the elastic adjustable contact.

In order to achieve the above purpose, the utility model provides the following technical scheme: a seal head convex surface coaxiality adjusting device comprises a central positioning sleeve, a plurality of cross rods, a plurality of vertical rods, a reinforcing part and an elastic positioning part;

the central positioning sleeve is arranged in a cylindrical shape, the cross rods are distributed along the outer wall of the periphery of the central positioning sleeve in an array mode, and one end of each cross rod is radially connected to the outer wall of the central positioning sleeve along the central positioning sleeve;

the number of the vertical rods corresponds to that of the cross rods, and the vertical rods are vertically connected to the end parts, extending from the cross rods and far away from the central positioning sleeve, of the central positioning sleeve along the direction parallel to the central shaft of the central positioning sleeve;

a plurality of bushings are sequentially sleeved in the central positioning sleeve from outside to inside, and the sizes of two adjacent bushings are matched; the first size adjusting mechanism is arranged on the cross rod and used for adjusting the length of the cross rod; the vertical rod is provided with a second size adjusting mechanism, and the second size adjusting mechanism is used for adjusting the length of the vertical rod;

the reinforcing part is arranged between any group of connected cross rods and vertical rods and is respectively and fixedly connected with the cross rods and the vertical rods;

the elastic positioning part is arranged at the bottom of any vertical rod and is positioned at the side of the vertical rod close to the central positioning sleeve, and when the elastic positioning part is subjected to acting force along the extending direction of the cross rod, the elastic positioning part has the degree of freedom of deformation along the direction of the acting force.

Furthermore, the elastic positioning part comprises a positioning rod, an elastic element and a stop block;

the bottom of the vertical rod is provided with a first through hole which penetrates through the vertical rod along the extending direction of the cross rod, and the positioning rod penetrates through the elastic element and the first through hole in sequence from the side, close to the central positioning sleeve, of the vertical rod and then is detachably connected to the stop block;

when the positioning rod is detachably connected with the stop block, the elastic element is in a non-limit compression state.

Further, the bushing is a cylindrical bushing or a polygonal bushing; when two adjacent bushings include a polygonal bushing and a cylindrical bushing, the circumscribed circle of the polygonal bushing is sized to fit the inner diameter of the cylindrical bushing outside thereof or the inscribed circle of the polygonal bushing is sized to fit the outer diameter of the cylindrical bushing inside thereof.

Further, the cross bar comprises a first cross bar and a second cross bar inserted in the first cross bar; the first size adjusting mechanism comprises a plurality of groups of first size adjusting holes and a first locking screw rod, the first size adjusting holes and the first locking screw rod are correspondingly arranged at the mutual near ends of the first cross rod and the second cross rod, and the first locking screw rod is used for fixedly locking any group of first size adjusting holes on the first cross rod and the second cross rod.

Furthermore, the vertical rod comprises a first vertical rod and a second vertical rod inserted in the first vertical rod; the second size adjusting mechanism comprises a plurality of groups of second size adjusting holes and second locking screw rods, the second size adjusting holes and the second locking screw rods are correspondingly arranged at the mutual near ends of the first vertical rod and the second vertical rod, and the second locking screw rods are used for fixedly locking any group of second size adjusting holes on the first vertical rod and the second vertical rod.

Furthermore, the connected cross rods and vertical rods at least comprise 3 groups.

Further, the reinforcing part is arranged as a reinforcing rib plate; the reinforcing rib plate is arranged at the position where any group of transverse rods and vertical rods form a direct bending.

Further, the elastic element is a spring or a disc spring.

Furthermore, the materials of the central positioning sleeve, the cross rod, the vertical rod, the first size adjusting mechanism and the second size adjusting mechanism are the same as those of the seal head.

Furthermore, a first thread is arranged at the end part of the positioning rod extending out of the first through hole, a second through hole is arranged on the stop block, and a second thread is arranged in the second through hole; the second thread is adapted to the first thread.

According to the technical scheme, the technical scheme of the utility model has the following beneficial effects:

the utility model discloses a device for adjusting the coaxiality of convex surfaces of end sockets, which comprises a central positioning sleeve, a plurality of cross rods, a plurality of vertical rods, a reinforcing part and an elastic positioning part, wherein the central positioning sleeve is sequentially sleeved with a plurality of bushings from outside to inside; the bushing, the first size adjusting mechanism and the second size adjusting mechanism are respectively used for being suitable for seal heads of parts to be assembled in different sizes, different diameters and different heights. The central positioning sleeve is arranged in a cylindrical shape, one end of the cross rod is connected with the central positioning sleeve and is distributed along the peripheral outer wall of the central positioning sleeve in an array manner; the number of the vertical rods corresponds to that of the cross rods, and the vertical rods are vertically connected to the end parts of the cross rods along the direction parallel to the central shaft of the central positioning sleeve; the reinforcing parts are respectively and fixedly connected with the connected cross rod and the connected vertical rod; elastic positioning portion sets up and is close to central positioning sleeve side in arbitrary montant bottom, when it received the effort along horizontal pole extending direction, has the degree of freedom that takes place deformation along this effort direction. This device can satisfy the head diameter through the deformation of elasticity location portion and change along with the measurement space demand that the tolerance variation caused, and accurate survey axiality is automatic adjustment in setting for the within range, has not only guaranteed the axiality requirement, has improved device adaptability moreover.

The elastic positioning part comprises a positioning rod, an elastic element and a stop block; the bottom of the vertical rod is provided with a first through hole which penetrates through the vertical rod along the extending direction of the cross rod, and the positioning rod penetrates through the elastic element and the first through hole in sequence from the side of the vertical rod close to the central positioning sleeve and then is detachably connected to the stop block; when the positioning rod is detachably connected with the stop block, the elastic element is in a non-limit compression state; therefore, when the dimensional tolerance of the end socket is large, the elastic element is further compressed; when the size tolerance of the end socket is small, the elastic element can further recover the original length, and the coaxiality determination scene of the tolerance change of the end socket is fully met. When the device is applied to the positioning or welding of the convex surface of the end socket centering accessory, the coaxiality of the accessory and the end socket can be effectively ensured, and the coaxiality can be controlled to be not more than 0.15. The device is designed by considering the applicability principle, and when the diameter of the seal head changes along with the change of tolerance, the diameter of the seal head can be automatically adjusted within a set range, so that the device is completely applicable, the coaxiality requirement is ensured, and the adaptability is improved.

It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be considered as part of the inventive subject matter of the present disclosure unless such concepts are mutually inconsistent.

The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description taken in conjunction with the accompanying drawings. Additional aspects of the present invention, such as features and/or advantages of exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of specific embodiments in accordance with the teachings of the present invention.

Drawings

The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:

FIG. 1 is a perspective view of a convex coaxiality adjusting device of a seal head of the utility model;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is a view showing a state of the present invention in use on a convex surface of a head;

FIG. 4 is a top view of the present invention in a convex use state of the head;

FIG. 5 is a front view of the present invention in a convex use state of the head;

fig. 6 is a sectional view taken along the line B-B in fig. 5.

In the figure, the specific meaning of each mark is:

1-center positioning sleeve, 2-cross bar, 3-vertical bar, 4-reinforcing part, 5-elastic positioning part, 5.1-positioning bar, 5.2-elastic element, 5.3-stop block, 6-convex end socket surface and 7-centering fitting.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the utility model without any inventive step, are within the scope of protection of the utility model. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.

The use of "first," "second," and similar terms in the description and claims of the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Similarly, the singular forms "a," "an," or "the" do not denote a limitation of quantity, but rather denote the presence of at least one, unless the context clearly dictates otherwise. The terms "comprises," "comprising," or the like, mean that the elements or items listed before "comprises" or "comprising" encompass the features, integers, steps, operations, elements, and/or components listed after "comprising" or "comprising," and do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. "upper", "lower", "left", "right", and the like are used only to indicate relative positional relationships, and when the absolute position of the object to be described is changed, the relative positional relationships may also be changed accordingly.

Based on the prior art that centering accessories are arranged on the axis of the convex surface of the end socket in a coaxiality determining mode, most of the coaxiality determining method is realized by measuring the distance from a part to the edge of the end socket repeatedly, but the method is only suitable for occasions with low requirement on coaxiality and cannot be used for occasions with high requirement on coaxiality; or a simple coaxiality positioning tool is adopted to determine the coaxiality, but when the diameter of the end socket changes greatly along with the tolerance, the tool cannot meet the coaxiality requirement; therefore, the utility model aims to provide the convex surface coaxiality adjusting device for the end socket, which realizes the elastic adjustable contact with the convex surface of the end socket by arranging the elastic positioning part, not only can meet the higher coaxiality requirement, but also can change along with the change when the diameter of the end socket changes along with the tolerance so as to ensure the coaxiality requirement.

The convex coaxiality adjusting device for the end socket is further specifically described below by referring to the embodiment shown in the attached drawings.

The head convex surface coaxiality adjusting device shown in fig. 1 comprises a central positioning sleeve 1, a plurality of cross rods 2, a plurality of vertical rods 3, a reinforcing part 4 and an elastic positioning part 5; as shown in the figure, the center positioning sleeve 1 is arranged in a cylinder shape, the cross rods 2 are distributed along the outer wall array of the periphery of the center positioning sleeve 1, and one end of each cross rod 2 is connected to the outer wall of the center positioning sleeve 1 along the radial direction; the number of the vertical rods 3 is equal to that of the cross rods 2, and the vertical rods 3 are perpendicularly connected to the end parts of the cross rods 2, which extend away from the central positioning sleeve 1, along the direction parallel to the central axis of the central positioning sleeve 1.

In order to improve the applicability of the device, a plurality of bushings are sequentially sleeved in the central positioning sleeve 1 from outside to inside, and the sizes of two adjacent bushings are matched; the cross rod 2 is provided with a first size adjusting mechanism, and the first size adjusting mechanism is used for adjusting the length of the cross rod 2; the vertical rod 3 is provided with a second size adjusting mechanism, and the second size adjusting mechanism is used for adjusting the length of the vertical rod 3; the device is suitable for centering fittings 7 with different sizes and sealing head convex surfaces 6 with different diameters and heights through the bushing, the first size adjusting mechanism and the second size adjusting mechanism.

The reinforcing part 4 is arranged between the cross rod 2 and the vertical rod 3 which are connected in any group and is respectively and fixedly connected with the cross rod 2 and the vertical rod 3; the reinforcing portion 4 is used for reinforcing the connection strength of the cross bar 2 and the vertical bar 3. In specific implementation, in order to ensure that all components of the adjusting device are fixed stably and firmly, the central positioning sleeve 1 is connected with the cross rod 2 through threads, riveting, welding or other modes, and the cross rod 2 is connected with the vertical rod 3 through welding, threads, riveting or other modes, preferably welding; the reinforcing part 4 is generally arranged as a reinforcing rib plate, the reinforcing rib plate is arranged at the position where any group of the transverse rods 2 and the vertical rods 3 form a direct bending, and the firmness of the connection of the transverse rods 2 and the vertical rods 3 is enhanced through the reinforcing rib plate.

Elastic locating portion 5 sets up in arbitrary montant 3 bottom, is located montant 3 and is close to central positioning sleeve 1 side to when elastic locating portion 5 received the effort along the horizontal pole 2 extending direction, have along the degree of freedom that this effort direction takes place deformation. In practice, the deformation includes further deformation based on the initial deformation and reduction of the deformation based on the initial deformation.

As shown in fig. 2, the elastic positioning portion 5 includes a positioning rod 5.1, an elastic element 5.2 and a stopper 5.3; specifically, the bottom of the vertical rod 3 is provided with a first through hole penetrating through the vertical rod 3 along the extending direction of the cross rod 2, and the positioning rod 5.1 penetrates through the elastic element 5.2 and the first through hole in sequence from the side, close to the central positioning sleeve 1, of the vertical rod 3 and then is detachably connected to the stop block 5.3; in order to realize the self-adaptation of the elastic positioning part 5 to the head diameter with tolerance, when the positioning rod 5.1 is detachably connected with the stop 5.3, the elastic element 5.2 is in a non-limit compression state, so that the stop 5.3 limits the elastic element, and the positioning rod 5.1 is ensured to have a movable degree of freedom in a certain range.

In addition, in the present embodiment, for positioning the centering fitting 7 with different shapes, the bushings are provided as cylindrical bushings or polygonal bushings, and when two adjacent bushings include a polygonal bushing and a cylindrical bushing, the circumscribed circle of the polygonal bushing is sized to fit the inner diameter of the cylindrical bushing on the outer side thereof or the inscribed circle of the polygonal bushing is sized to fit the outer diameter of the cylindrical bushing on the inner side thereof. The bushing can then be selected to fit according to the dimensions of the centering fitting 7.

Referring to fig. 3 to 6, when the device works, the convex surface 6 of the end socket is vertically and upwardly placed on the operating platform, then the vertical rod 3 of the device is assembled with the convex surface 6 of the end socket downwards, and when the positioning rod 5.1 is in contact with the convex surface 6 of the end socket, the central positioning sleeve 1 is pressed downwards with force; under the effect of force, the positioning rod 5.1 is displaced and extrudes the elastic element 5.2 until the lower end face of the vertical rod 3 is attached to the operating platform, and the matching of the adjusting device and the seal head convex surface 6 is completed at the moment. Because the elastic positioning part 5 has the same structure, the stiffness coefficients of the elastic elements 5.2 are consistent, and the extrusion deformation is also consistent, thereby ensuring that the axes of the central positioning sleeve 1 and the seal head convex surface 6 are on the same straight line. Then, the centering fitting 7 is placed in the center positioning sleeve 1, proper adjustment is carried out, and the centering fitting 7 and the seal head convex surface 6 are fixed in a spot welding mode, so that the coaxiality of the centering fitting 7 and the seal head convex surface 6 is guaranteed. Multiple tests show that the coaxiality of the centering fitting 7 and the convex surface 6 of the end socket does not exceed 0.15mm, and the practical use requirement is met.

When the diameter of the convex surface 6 of the end socket changes due to tolerance, the central positioning sleeve 1 is pressed down by force, and the degree of the elastic element 5.2 extruded by the positioning rod 5.1 is automatically adjusted, so that the adjusting device can be suitable for the situation that the nominal diameter of the end socket changes along with the tolerance. The device adapts to and adjusts different sizes through the elastic positioning part 5, and can be widely applied to positioning and welding of various types of seal head convex surface 6 axis position parts.

In some embodiments, the crossbar 2 comprises a first crossbar and a second crossbar inserted inside the first crossbar; the first size adjusting mechanism comprises a plurality of groups of first size adjusting holes and a first locking screw rod which are correspondingly arranged at the mutual near ends of the first cross rod and the second cross rod, and the first locking screw rod is used for fixedly locking any group of first size adjusting holes on the first cross rod and the second cross rod. The vertical rod 3 comprises a first vertical rod and a second vertical rod inserted in the first vertical rod, the second size adjusting mechanism comprises a plurality of groups of second size adjusting holes and second locking screw rods, the second size adjusting holes and the second locking screw rods are correspondingly arranged at the mutual near ends of the first vertical rod and the second vertical rod, and the second locking screw rods are used for fixedly locking any group of second size adjusting holes in the first vertical rod and the second vertical rod.

In other embodiments, the first size adjustment mechanism and the second size adjustment mechanism are provided as lead screw adjustment mechanisms, and the length of the cross rod 2 or the vertical rod 3 is adjusted through rotation of a lead screw.

Based on the principle of triangle stability, the adjusting device has at least 3 groups of connected cross rods 2 and vertical rods 3, and generally no more than 6 groups, in order to achieve the technical effect of coaxiality acquisition.

In an embodiment, the elastic element 5.2 may be selected from a spring or a disc spring.

In addition, in order to prevent pollution among different materials, the parts of the adjusting device, such as the central positioning sleeve 1, the positioning rod 5.1 and the like, which are in contact with the convex surface 6 of the end socket are made of materials which are adaptive to the convex surface 6 of the end socket; other parts which are not contacted with the convex surface 6 of the end socket can be made of other materials, but the parts are made of materials which are adaptive to the convex surface 6 of the end socket, so that the whole attractiveness of the adjusting device is guaranteed, pollution is prevented, and the service life of the adjusting device is prolonged. Preferably, the central positioning sleeve 1, the cross rod 2, the vertical rod 3, the reinforcing part 4 and the positioning rod 5.1 are made of stainless steel materials in implementation.

Before the adjusting device of the embodiment is used, necessary calculation or simulation needs to be carried out according to the nominal diameter of the convex surface 6 of the end socket so as to preliminarily and reasonably set the lengths of the cross rod 2 and the vertical rod 3. When the nominal diameter of the convex surface 6 of the end socket is changed greatly, the lengths of the cross rod 2 and the vertical rod 3 are adjusted through the first size adjusting mechanism and the second size adjusting mechanism.

As further shown in fig. 6, a first thread is provided on the end of the positioning rod 5.1 extending out of the first through hole, a second through hole is provided on the stopper 5.3, and a second thread is provided in the second through hole, the second thread being adapted to the first thread; namely, the positioning rod 5.1 is fixedly connected with the stop block 5.3 through threads. In the embodiment shown in the attached drawings, the positioning rod 5.1 adopts a movable positioning pin rod, the stop block 5.3 adopts a check ring, and when the device needs to be replaced due to the change of the nominal diameter or the abrasion caused by long-time use, the check ring can be detached for replacing the movable positioning pin rod, so that the adaptability of the device is further improved.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims

1. A seal head convex surface coaxiality adjusting device is characterized by comprising a central positioning sleeve, a plurality of cross rods, a plurality of vertical rods, a reinforcing part and an elastic positioning part;

2. The convex surface coaxiality adjusting device of the end socket according to claim 1, wherein the elastic positioning part comprises a positioning rod, an elastic element and a stop block;

3. A convex face coaxiality adjusting device for a head according to claim 1, wherein the bushing is a cylindrical bushing or a polygonal bushing; when two adjacent bushings include a polygonal bushing and a cylindrical bushing, the circumscribed circle of the polygonal bushing is sized to fit the inner diameter of the cylindrical bushing outside thereof or the inscribed circle of the polygonal bushing is sized to fit the outer diameter of the cylindrical bushing inside thereof.

4. The convex end socket coaxiality adjusting device according to claim 1, wherein the cross rods comprise a first cross rod and a second cross rod inserted inside the first cross rod; the first size adjusting mechanism comprises a plurality of groups of first size adjusting holes and a first locking screw rod, the first size adjusting holes and the first locking screw rod are correspondingly arranged at the mutual near ends of the first cross rod and the second cross rod, and the first locking screw rod is used for fixedly locking any group of first size adjusting holes on the first cross rod and the second cross rod.

5. The seal head convex surface coaxiality adjusting device according to claim 1, wherein the vertical rods comprise a first vertical rod and a second vertical rod inserted inside the first vertical rod; the second size adjusting mechanism comprises a plurality of groups of second size adjusting holes and second locking screw rods, the second size adjusting holes and the second locking screw rods are correspondingly arranged at the mutual near ends of the first vertical rod and the second vertical rod, and the second locking screw rods are used for fixedly locking any group of second size adjusting holes on the first vertical rod and the second vertical rod.

6. A convex coaxiality adjustment device for a closure head according to claim 1, wherein the connected cross bars and vertical bars comprise at least 3 groups.

7. The convex surface coaxiality adjusting device for the end socket according to claim 1, wherein the reinforcing part is provided with a reinforcing rib plate; the reinforcing rib plate is arranged at the position where any group of transverse rods and vertical rods form a direct bending.

8. A convex coaxiality adjustment device for a closure head according to claim 2, wherein the elastic element is a spring or a disc spring.

9. A convex coaxiality adjusting device for a head according to claim 1, wherein the central positioning sleeve, the cross rod, the vertical rod, the first size adjusting mechanism and the second size adjusting mechanism are made of the same material as the head.

10. The seal head convex surface coaxiality adjusting device according to claim 2, wherein a first thread is arranged at the end part of the positioning rod extending out of the first through hole, a second through hole is arranged on the stop block, and a second thread is arranged in the second through hole; the second thread is adapted to the first thread.